Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 46, NWS Mobile, AL

July 28, 2021Okaloosa County, Florida

NWS Mobile, AL issued this flash flood warning at Jul 28, 2021, 4:22 PM CDT for Okaloosa County, Florida. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 28, 2021, 4:22 PM CDT (21:22 UTC)
Expired: Jul 28, 2021, 9:14 PM CDT
In force: 5 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 66 km from the middle of the area, began a volume at 21:25 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.4 hours before the alert went out and 222 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 679 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 861 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

970 
WGUS54 KMOB 282122
FFWMOB
FLC091-290315-
/O.NEW.KMOB.FF.W.0046.210728T2122Z-210729T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
422 PM CDT Wed Jul 28 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Northeastern Okaloosa County in northwestern Florida...

* Until 1015 PM CDT.

* At 422 PM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 and 3 inches of rain have fallen. The expected rainfall rate is 
  1.5 to 2.5 inches in 1 hour. Additional rainfall amounts of 1 to 3 
  inches are possible in the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Crestview, Silver Springs, Killingsworth Crossroads, Auburn, 
  Garden City, Deerland, Milligan, Dorcas, Campton and Clear Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3089 8666 3088 8639 3060 8640 3061 8668
      3071 8667

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...1.5-2.5 INCHES IN 1 HOUR

$$

MM/CL

1 follow-up statement

361 
WGUS74 KMOB 290214
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
914 PM CDT Wed Jul 28 2021

FLC091-290224-
/O.CAN.KMOB.FF.W.0046.000000T0000Z-210729T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Okaloosa FL-
914 PM CDT Wed Jul 28 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN OKALOOSA 
COUNTY...

The heavy rain has ended and waters have receded. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3089 8666 3088 8639 3060 8640 3061 8668
      3071 8667

$$

21/CLL

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 28, 1:46 PM CDT	Heat Advisory	MOB	Escambia, Okaloosa, Santa Rosa	44 hr
Jul 28, 1:46 PM CDT	Heat Advisory	MOB	Escambia, Okaloosa, Santa Rosa	4 days
Jul 28, 3:21 PM CDT	Special Weather Statement	MOB	Okaloosa	39 min
Jul 28, 3:27 PM CDT	Special Weather Statement	MOB	Santa Rosa	48 min
Jul 28, 3:37 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	23 min
Jul 28, 3:55 PM CDT	Special Weather Statement	MOB	Okaloosa	50 min
Jul 28, 3:58 PM CDT	Severe Thunderstorm Warning	MOB	Santa Rosa	32 min
Jul 28, 4:08 PM CDT	Areal Flood Advisory	MOB	Okaloosa	14 min
Jul 28, 4:32 PM CDT	Special Weather Statement	MOB	Santa Rosa	43 min
Jul 28, 4:33 PM CDT	Areal Flood Advisory	MOB	Santa Rosa	3 hr
Jul 28, 5:16 PM CDT	Areal Flood Advisory	MOB	Okaloosa	3 hr
Jul 28, 5:39 PM CDT	Areal Flood Advisory	MOB	Okaloosa, Santa Rosa	3 hr
Jul 28, 6:48 PM CDT	Areal Flood Advisory	MOB	Escambia, Santa Rosa	3 hr

Nearby

Flash Flood Warnings in Florida, 2021 Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.